CN105122944A - Control circuit of light-emitting diode lighting device - Google Patents
Control circuit of light-emitting diode lighting device Download PDFInfo
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- CN105122944A CN105122944A CN201480011047.6A CN201480011047A CN105122944A CN 105122944 A CN105122944 A CN 105122944A CN 201480011047 A CN201480011047 A CN 201480011047A CN 105122944 A CN105122944 A CN 105122944A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Disclosed is the control circuit of a light-emitting diode lighting device which performs lighting using a rectified voltage and has improved flicker. The control circuit of the light-emitting diode lighting device comprises a charging/discharging module for performing charging by means of a rectified voltage and discharging for light-emitting diode channels and supplies a voltage from the charging/discharging module to the light-emitting diode channels at least during a control interval including a lowest current time point, at which the amount of current supplied to the light-emitting diode channels reaches the lowest level, by controlling the charging timing, charging voltage, and/or discharging timing of the charging/discharging module. Accordingly, the flicker of the light-emitting diode lighting device can be improved.
Description
Technical field
The present invention relates to a kind of LED light device, particularly, relate to a kind of control circuit of LED light device, it can utilize commutating voltage to reduce flicker (flicker) when luminescence.
Background technology
According to the recent trend of lighting technology, LED is used as light source, with energy savings.
High-brightness LED is different from other light sources in the quality etc. of such as energy consumption, life-span and light.
But, be using LED as the problem of the lighting device of light source, due to the characteristic that LED is driven by constant current, need extra circuit.
For to solve the problem and the example of the lighting device developed can comprise interchange directly driving (ACDIRECTTYPE) lighting device.
Usually, exchange direct driving LED lighting device and be designed to compress into row rectification to commercial electrical, and use the voltage driven LED after rectification, the voltage after described rectification has the ripple LED of twice larger than the frequency of commercial voltage.
Because the direct driving LED lighting device of described interchange does not use inductor (inductor) and capacitor, but the voltage after rectification is directly used as input voltage, therefore exchange direct driving LED and there is gratifying power coefficient (POWERFACTOR).
Such as, each LED in LED light device can be designed to run under 2.8V or 3.8V.Further, LED light device can be designed to be run by commutating voltage, and the level (level) of described commutating voltage is for making the LED of a large amount of series connection can be luminous.
When the ripple of commutating voltage increases/reduces, a large amount of LED be included in LED light device can in each LED channel successively opening/closing.
Owing to providing the commutating voltage of driving LED lighting device to have ripple, so commutating voltage has one interval, in this interval commutating voltage be reduced to LED channel can not luminescence.
In other words, due to ripple, the commutating voltage of LED light device is down to below the luminous voltage of LED.Therefore the electric current being supplied to each LED channel has one interval, and in this interval, electric current is down to and is minimumly then risen.
When whole LED channel is by temporary close, flicker (Flicker) can be produced.Flicker can reduce Consumer's Experience and increase the fatigue strength of user.
Based on PSE standard, Japan uses the flicker level of the LED light device of commutating voltage to formulate a kind of standard.Such as, the PES standard of Japan suggested a flicker standards, when the commutating voltage frequency of driving LED is 100Hz to 500Hz, based on 100%, can keep luminous when flicker level is 5% or more.
Thus, the LED light device that exploitation drives according to the characteristic of commutating voltage is needed, flicker can be reduced.
Summary of the invention
Each embodiment of the present invention aims to provide a kind of control circuit of LED light device, and it can reduce the generation of flicker.
Of the present invention each embodiment still provides a kind of control circuit of LED light device, and it can by controlling charging interval, charging voltage and the one or more generations reducing flicker in discharge time.
Of the present invention each embodiment still provides a kind of control circuit of LED light device, and it can discharge during generation flicker, so that LED channel maintains minimum luminance, thus reduces the generation of flicker.
Of the present invention each embodiment still provides a kind of control circuit of LED light device, it can use the voltage lower than commutating voltage maximum (crest voltage) to perform charging operations, and electric discharge during generation flicker, thus reduce the generation of flicker.
In one embodiment, provide a kind of control circuit of LED light device, described LED light device comprises multiple LED channel, and described control circuit comprises: current control circuit, it is in response to commutating voltage, provides corresponding to LED channel current path luminous successively; Flicker reduction circuit, comprise and carry out by commutating voltage the charge-discharge modules that charges and LED channel is discharged, described flicker reduction circuit is configured to control charging interval of charge-discharge modules, charging voltage and one or more in discharge time, so that described charge-discharge modules is at least that voltage is provided to LED channel by minimum control period at the magnitude of current being provided to LED channel.
According to embodiments of the invention, described control circuit can control charging interval, charging voltage and one or more in discharge time, and can reduce the generation of flicker, therefore improves the reliability of the described lighting device driven by described commutating voltage.
Further, for fully reducing the flicker caused by discharge and recharge, the capacitor of low capacity can be used.Therefore, although employ capacitor, the decline of useful life or power coefficient is minimized, and can reduce flicker.
Further, when keeping minimum luminance, described LED light device can perform illumination, therefore reduces flicker.
Further, because described charging operations performs when peak value (maximum) lower than commutating voltage, therefore capable of reducing energy consumption.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the LED light device control circuit according to the embodiment of the present invention.
Fig. 2 is the detailed circuit diagram of current control circuit shown in Fig. 1.
Fig. 3 is the oscillogram be described to glimmering in common LED lighting device.
Fig. 4 to Fig. 7 is the oscillogram that embodiment illustrates the operation of described control circuit according to Fig. 1.
Fig. 8 is the circuit diagram be described another embodiment of the present invention.
Fig. 9 is the circuit diagram be described another embodiment of the present invention.
Figure 10 be to charge-discharge modules in Fig. 9, discharge switch and discharge time control unit the detailed circuit diagram that is described of an embodiment.
Figure 11 be to charge-discharge modules in Fig. 9, discharge switch and discharge time control unit the detailed circuit diagram that is described of another embodiment.
Figure 12 is according to the oscillogram be described the operation of described control circuit embodiment illustrated in fig. 9.
Figure 13 is the schematic layout pattern be described the behaviour area of transistor in current control circuit.
Embodiment
Below, with reference to accompanying drawing, exemplary embodiment of the present invention is described in detail.The term that this specification and claims book uses should not be construed as limiting the meaning in usual or dictionary, and is interpreted as the meaning and the concept of technological thought according to the invention.
Embodiment described in this specification and the formation shown by accompanying drawing are preferred embodiments of the present invention, not represent whole technological thought of the present invention, and therefore the present invention can have various variation and equipollent.
Embodiments of the invention disclose a kind of control circuit exchanging direct driving LED lighting device.
Commutating voltage for exchanging direct driving LED lighting device can have the ripple obtained by carrying out full-wave rectification to alternating voltage, has the characteristic that ripple as shown in Fig. 3 to Fig. 7 and Figure 12 is elevated repeatedly.
As shown in Figure 1, can be set to carry out Current adjustment to the luminescence of lamp 10 according to the LED light device control circuit of the embodiment of the present invention.
With reference to Fig. 1, described LED light device can comprise lamp 10, power supply unit, current control circuit 14 and flicker and reduce circuit.Described power supply unit can provide commutating voltage to lamp 10 by conversion alternating voltage, and each LED channel LED1 to LED4 that described current control circuit 14 can be lamp 10 is provided for luminous current path.
Lamp 10 comprises multiple LED, and described multiple LED is divided into multiple LED channel LED1 to LED4.According to the ripple of the commutating voltage provided from described power supply unit, can opening/closing successively at multiple LED of each LED channel lamp 10.
Lamp 10 shown in Fig. 1 comprises four LED channel, LED1, LED2, LED3, LED4.LED1, LED2, LED3, LED4 of each LED channel can comprise the LED of identical or different number, and each LED channel LED1, dotted line in LED2, LED3, LED4 represent and eliminate illustrating LED.
The alternating voltage that described power supply unit can be set to input to external world carries out rectification, and exports commutating voltage.
Described power supply unit can comprise: the AC power VAC with alternating voltage; Rectification circuit 12, is placed through alternating voltage described in rectification and exports commutating voltage.Described AC power VAC can comprise source power supply.
Described rectification circuit 12 can compress into row full-wave rectification to the sine wave alternating current of AC power VAC, and exports commutating voltage.As shown in Fig. 3 to Fig. 7 and Figure 12, described commutating voltage can have ripple, wherein voltage level based on alternating voltage half period and be elevated.In an embodiment of the present invention, commutating voltage rising or decline and can indicate rising or the decline of the ripple of commutating voltage.
The luminescence that current control circuit 14 can be LED channel LED1 to 4 regulates electric current.
Described current control circuit 14 can be placed through electric current inductive reactance Rs for Current adjustment provides current path, the end ground connection of described electric current inductive reactance Rs.
In embodiments of the invention, in response to rising or the decline of commutating voltage, the LED channel LED1 to LED4 of lamp 10 can open or close successively.
When commutating voltage rises and reaches the luminous voltage of each LED channel LED1 to LED4 successively, the luminescence that current control circuit 14 can be each LED channel LED1 to LED4 provides current path.In described current control circuit 14, c1, c2, c3, c4 are expressed as the terminal that each LED channel LED1 to LED4 provides current path.
Now, the luminous voltage V4 of LED channel LED4 luminescence be may be defined as make the voltage that all LED channel LED1 to LED4 are luminous, the luminous voltage V3 of LED channel LED3 luminescence be may be defined as make the voltage that LED channel LED1, LED2, LED3 are luminous, the luminous voltage V2 of LED channel LED2 luminescence be may be defined as make the voltage that LED channel LED1, LED2 are luminous, make the luminous voltage V1 of LED channel LED1 luminescence may be defined as the voltage only having LED channel LED1 luminescence.
Current control circuit 14 is by electric current inductive reactance Rs received current induced voltage.Current sense voltage can change with current path, and wherein current path can be formed discriminatively according to the luminance of LED channel each in lamp 10.Now, the electric current flowing through electric current inductive reactance Rs can comprise constant current.
Described current control circuit can be set to as shown in Figure 2.With reference to Fig. 2, described current control circuit 14 can comprise: multiple switching circuit 31 to 34, for each LED channel LED1 to LED4 provides current path; Reference voltage feed unit 20, for providing reference voltage V REF1 to VREF4.
According to the intention of designer, the reference voltage V REF1 to VREF4 that described reference voltage feed unit 20 can provide level different.
Such as, described reference voltage feed unit 20 can comprise multiple resistance of series connection to receive constant voltage, and is exported the reference voltage V REF1 to VREF4 with varying level by the node between each resistance.In another embodiment, reference voltage feed unit 20 can comprise independently voltage supply source, to provide the REF1 to VREF4 of the reference voltage V with varying level.
In the reference voltage V REF1 to VREF4 with varying level, reference voltage V REF1 can have minimum level, and reference voltage V REF4 can have the highest level.Level progressively can improve according to the order of reference voltage V REF1, VREF2, VREF3, VREF4.
When LED channel LED2 is luminous, reference voltage V REF1 can have the level of closing switch circuit 31.More specifically, reference voltage V REF1 can be set as that level is formed at the current sense voltage in electric current inductive reactance Rs lower than the luminous voltage V2 by LED channel LED2.
When LED channel LED3 is luminous, reference voltage V REF2 can have the level of closing switch circuit 32.More specifically, reference voltage V REF2 can be set as that level is formed at the current sense voltage in electric current inductive reactance Rs lower than the luminous voltage V3 by LED channel LED3.
When LED channel LED4 is luminous, reference voltage V REF3 can have the level of closing switch circuit 33.More specifically, reference voltage V REF3 can be set as that level is formed at the current sense voltage in electric current inductive reactance Rs lower than the luminous voltage V4 by LED channel LED4.
Reference voltage V REF4 can be set as making the electric current be formed in electric current inductive reactance Rs in the upper limit region of commutating voltage become constant current.
Switching circuit 31,32,33,34 can be connected to the electric current inductive reactance Rs providing current sense voltage jointly, thus performs Current adjustment and form current path.
The reference voltage V REF1 of the current sense voltage of electric current inductive reactance Rs and reference voltage feed unit 20, VREF2, VREF3, VREF4 can compare, and form selectivity current path for turning on lamp 10 by switching circuit 31,32,33,34.
When switching circuit is connected to the LED channel away from commutating voltage applying position, each switching circuit 31,32,33,34 can receive the reference voltage of high level.
Each switching circuit 31,32,33,34 can comprise comparator 50 and switch element, and switch element can comprise nmos pass transistor 52.
The comparator 50 be included in switching circuit 31,32,33,34 can have: the positive input terminal (+) receiving reference voltage, the negative input terminal (-) of received current induced voltage, and the lead-out terminal exporting the result obtained by benchmark voltage and current induced voltage.
The nmos pass transistor 52 be included in each switching circuit 31,32,33,34 can perform switching manipulation according to the output of the comparator 50 being applied to grid.
In one embodiment, can not comprise voltage control circuit 48, charging interval control unit 40 can directly control charge switch 44.
Like this, between the charge period preset, flicker reduces circuit and commutating voltage can be utilized to charge, and to discharge LED to LED channel LED1 to LED4 in the minimum control period of the magnitude of current being supplied to LED channel LED1 to LED4.
Described flicker reduces circuit can comprise charge-discharge modules 60, and described charge-discharge modules 60 utilizes commutating voltage to charge, and discharges to multiple LED channel LED1 to LED4.Described flicker reduces one or more discharge and recharge times of charge-discharge modules 60 described in circuit being controllable system, and controls described charge-discharge modules 60 to provide voltage to LED channel.Described flicker reduces circuit can comprise described charge-discharge modules 60, charging control circuit and charge/discharge control circuit.Described charge-discharge modules 60 can perform charging and discharging.Described charging control circuit can provide commutating voltage to described charge-discharge modules 60 between charge period.Described in control period, charge/discharge control circuit can provide the voltage of charge-discharge modules 60 to described multiple LED channel LED1 to LED4.
Described charge-discharge modules 60 can comprise capacitor C or fill out paddy circuit.Described charge-discharge modules 60 can comprise constant voltage source, and it arranges in detail and is described hereinafter with reference to Figure 10,11.
Described charging control circuit can comprise charge switch 44 and charging interval control unit 40.Commutating voltage can be switched to charge-discharge modules 60 by described charge switch 44.Described charging interval control unit 40 can open charge switch 44 between charge period.
When described charging interval control unit 40 is set to directly control described charge switch 44, described charge switch 44 can be opened between charge period.The commutating voltage that described charge-discharge modules 60 can utilize the charge switch 44 by opening to provide charges.
Described charge/discharge control circuit can comprise discharge switch 46 and discharge time control unit 42.Described discharge switch 46 can the voltage switching of supply charge-discharge modules 60 to described multiple LED channel LED1 to LED4, and described discharge time, control unit 42 can open discharge switch 46 at control period.
By setting mentioned above, in response to control period, described discharge time, control unit 42 can open described discharge switch 46, and the voltage of charge-discharge modules 60 is provided to described multiple LED channel LED1 to LED4 by the discharge switch 46 opened.
For realizing embodiments of the invention, discharge switch 46 shown in Fig. 1 is connected with the input of LED channel LED1.But according to the intention of designer, discharge switch 46 can be connected with other LED channel LED2 to LED4.Like this, the position connected by discharge switch 46, can provide the voltage of charge-discharge modules 60.
But in an embodiment of the present invention, as shown in Figure 1, described charge switch 44 can be controlled by the result that combines with door according to the voltage control signal of the start signal of charging interval control unit 40 and voltage control unit 48.
Described voltage control circuit 48 can be set to output voltage control signal to represent the uncomfortable state of charging, and what comprise in the first state, the second state and the third state is one or more.Described first state can represent that the voltage be stored in charge-discharge modules 60 is equal to or greater than preset charged level, described second state can represent that the voltage be stored in described charge-discharge modules 60 is equal to or greater than commutating voltage, and the described third state represents that commutating voltage is equal to or less than predetermined level.The voltage control signal that voltage control unit 48 exports can be supplied to and door AND, and the described start signal that may be combined with voltage control signal and charging interval control unit 40 with door AND, and control the switching manipulation of described charge switch 44.
When described voltage control unit 48 to door provide represent current status and charging uncomfortable state not corresponding voltage control signal time, flicker reduces circuit can perform operation when directly being controlled by charging interval control unit 40 corresponding to charge switch 44.
When voltage control unit 48 to door provide represent current status and charging voltage control signal corresponding to uncomfortable state time, flicker reduce circuit can according to charging interval control unit 40 and voltage control signal with the unlatching of the output control charge switch 44 of operation.
In response to the setting of voltage control unit 48, flicker reduces circuit can comprise charging control circuit and charge/discharge control circuit.Described charging control circuit can provide commutating voltage to charge-discharge modules 60 between not corresponding with the uncomfortable state of charging charge period, and charge/discharge control circuit can provide the voltage of charge-discharge modules 60 at control period to multiple LED channel LED1 to LED4.
Described charging control circuit can comprise charge switch 44, charging interval control unit 40, ON-OFF control circuit.Commutating voltage can be provided to capacitor C as voltage source by described charge switch 44.Described charging interval control unit 40 can be unlatching charge switch 44 and provides start signal between charge period.But charging uncomfortable state be not inconsistent meet between charge period during in, described control switching circuit can open described charge switch 44 according to voltage control signal and start signal.
Described ON-OFF control circuit can comprise mentioned above with door AND.
When the voltage of described charge-discharge modules 60 is equal to or greater than the preset charged level of the first state being defined as the uncomfortable state of charging, because charge-discharge modules 60 fully charges, therefore its voltage can be corresponding with the state without the need to charging.Further, when the voltage of charge-discharge modules 60 is equal to or greater than the commutating voltage of the second state being defined as the uncomfortable state of charging, because the level of commutating voltage is lower, its voltage can be corresponding with the state that charge-discharge modules 60 is difficult to charge.Further, when commutating voltage is equal to or greater than the predetermined level of the third state being defined as uncomfortable state of charging, because the level of commutating voltage is lower, therefore its voltage also can be corresponding with the state that charge-discharge modules 60 is difficult to charge.
First, with reference to Fig. 3, the operation of the control circuit of common LED lighting device is described.
First, when commutating voltage is in initial condition, described multiple LED channel is not luminous.Therefore, electric current inductive reactance Rs can provide low level current sense voltage.
When commutating voltage is in initial condition, owing to being applied to the reference voltage V REF1 of each switching circuit 31 to 34 positive input terminal (+), VREF2, VREF3, VREF4 higher than the current sense voltage being applied to negative input terminal (-), therefore, each switching circuit 31,32,33,34 can remain on opening.
After this, when commutating voltage rises to luminous voltage V1, the LED channel LED1 of lamp 10 is luminous.When the LED channel LED1 of lamp 10 is luminous, the switching circuit 31 being connected to the current control circuit 14 of LED channel LED1 can provide current path.
When commutating voltage reach luminous voltage V1 make LED channel LED1 luminous and form current path by switching circuit 31 time, the level of the current sense voltage of electric current inductive reactance Rs can rise.But the level now due to current sense voltage is lower, therefore the opening of switching circuit 31,32,33,34 is constant.
After this, when commutating voltage continues rise and reach luminous voltage V2, the LED channel LED2 of lamp 10 is luminous.When the LED channel LED2 of lamp 10 is luminous, the switching circuit 32 being connected to the current control circuit 14 of LED channel LED2 can provide current path.Now LED channel LED1 still can keep luminance.
When commutating voltage reach luminous voltage V2 make LED channel LED2 luminous and form current path by switching circuit 32 time, the level of the current sense voltage of electric current inductive reactance Rs rises.Now, the level of current sense voltage is higher than reference voltage V REF1.Therefore, the nmos pass transistor 52 of switching circuit 31 is closed because of the output of comparator 50.In other words, switching circuit 31 is closed, and LED switch circuit 32 can provide the selectivity current path corresponding to LED channel LED2 luminescence.
After this, when commutating voltage continues rise and reach luminous voltage V3, the LED channel LED3 of lamp 10 is luminous.When the LED channel LED3 of lamp 10 is luminous, the switching circuit 33 being connected to the current control circuit 14 of LED channel LED3 can provide current path.Now, LED channel LED1, LED2 still keep luminance.
When commutating voltage reach luminous voltage V3 make LED channel LED3 luminous and form current path by switching circuit 33 time, the level of the current sense voltage of electric current inductive reactance Rs rises.Now, the level of current sense voltage is higher than reference voltage V REF2.Therefore, the nmos pass transistor 52 of switching circuit 32 is closed because of the output of comparator 50.In other words, switching circuit 32 cuts out, and LED switch circuit 33 provides the selectivity current path corresponding to LED channel LED3 luminescence.
After this, when commutating voltage continues rise and reach luminous voltage V4, the LED channel LED4 of lamp 10 is luminous.When the LED channel LED4 of lamp 10 is luminous, the switching circuit 34 being connected to the current control circuit 14 of LED channel LED4 can provide current path.Now, LED channel LED1, LED2, LED3 still keep luminance.
When commutating voltage reach luminous voltage V4 make LED channel LED4 luminous and form current path by switching circuit 34 time, the level of the current sense voltage of electric current inductive reactance Rs rises.Now, the level of current sense voltage is higher than reference voltage V REF3.Therefore, the nmos pass transistor 52 of switching circuit 33 is closed because of the output of comparator 50.In other words, switching circuit 33 cuts out, and LED switch circuit 34 provides the selectivity current path corresponding to LED channel LED2 luminescence.
After this, although commutating voltage continues to rise, because the level of the reference voltage V REF4 being provided to switching circuit 34 is higher than the current sense voltage be formed in electric current inductive reactance Rs by commutating voltage maximum, so switching circuit 34 remains on open mode.
As shown in Figure 3, when LED channel LED1, LED2, LED3, LED4 are luminous successively in response to the rising LED of commutating voltage, the electric current corresponding with luminance be staged increase.In other words, regulate because current control circuit 14 performs constant current, therefore corresponding with the luminescence of each LED channel electric current can remain on preset level.When the quantity of the LED channel of luminescence increases, in response to the increase of LED channel quantity, the level of electric current also can increase.
After rising to maximum level value as mentioned above, commutating voltage starts to decline.
When commutating voltage drops to lower than luminous voltage V4, the LED channel LED4 of lamp 10 can close.
When LED channel LED4 closes, lamp 10 keeps luminance by LED channel LED3, LED2, LED1.Thus, current path can be formed by the switching circuit 33 being connected to LED channel LED3.
After this, when commutating voltage is down to luminous voltage V3, luminous voltage V2, below luminous voltage V3 successively, LED channel LED3, LED2, LED1 of lamp 10 close successively.
When the LED channel LED3 of lamp 10, LED2, LED1 close successively, current control circuit 14 can carry out switching and provide selectivity current path by switching circuit 33,32,31.Further, in response to the closed condition of LED channel LED1, LED2, LED3, LED4, levels of current also can staged reduce.
As shown in Figure 3, the operation of common LED lighting device control circuit makes the magnitude of current within the flicker emergence period formed minimum.
In other words, when LED enter by the commutating voltage characteristic with ripple formed the trough phase (Valleyperiod) namely glimmer the emergence period time, be provided to the magnitude of current minimizing of LED channel LED1, LED2, LED3, LED4, thus close whole LED channel LED1, LED2, LED3, LED4 of lamp 10.
But in an embodiment of the present invention, the ripple of commutating voltage drops to the trough phase that then minimum point starts increase, namely during lamp Close All, can be set to control period.Then, when control circuit utilizes the voltage of charge-discharge modules 60 to perform to fill out paddy at control period, lamp 10 can minimally luminance.
In other words, because lamp 10 is in trough phase minimally luminance, the generation of flicker can therefore be reduced.
For this reason, as shown in Figure 4, after LED channel LED1 luminescence, can charge to charge-discharge modules 60 in embodiment shown in Fig. 1, until LED channel LED2 is luminous, and, when commutating voltage is down to below luminous voltage V1, the voltage of charge-discharge modules 60 is discharged to lamp group LED1 to LED4, thus remains on minimum luminance.
Now, as shown in Figure 4, minimum luminance can be set to the state that LED channel LED1 keeps luminous.
For realizing the charging operations shown in Fig. 4, by selecting commutating voltage S1, the electric current S2 being supplied to LED channel LED1 to LED4, that namely the electric current S3 to S6 of current path of each LED channel LED1 to LED4, the electric current S7 of current control circuit 14 are supplied in the electric current of electric current inductive reactance Rs is one or more as judgement source (determinationsource) Sa, and charging control circuit 40 described in embodiment illustrated in fig. 1 can arrange starting point between charge period and end point.
Such as, when electric current S3 in response to the upwelling of commutating voltage when the current path of LED channel LED1, the exportable start signal of charging interval control unit 40.Now, suppose that start signal is at high level output, to represent initiate mode.
When hypothesis voltage control unit 48 keeps high level output according to the judgement not corresponding to uncomfortable state of charging, the start signal of charging interval control unit 40 is by transferring to charge switch 44 with door AND.Charge switch 44 can be opened by the start signal of charging interval control unit 40, and provides commutating voltage to charge-discharge modules 60.The described commutating voltage of charge-discharge modules 60 charges.
Then, when commutating voltage rises to the level making LED channel LED2 luminescence, no current path between LED channel LED1 and current control circuit 14.Therefore, charging interval control unit 40 can not export start signal, but charge switch 44 is closed because of the operation of charging interval control unit 40.In other words, the charging of charge-discharge modules 60 stops.
Charging interval control unit 40 can be arranged so that, starting point between charge period is arranged on the time point that electric current S3 starts in response to the rising of commutating voltage to flow between LED channel LED1 and the terminal C1 of current control circuit 14, and the end point between charge period is arranged on the time point stopping flowing in response to the electric current S3 between the rising LED channel LED1 of commutating voltage and the terminal C1 of current control circuit 14.
In response to the decline of commutating voltage, electric current S3 flows through the current path of LED channel LED1, thus charging interval control unit 40 can stop exporting start signal.In other words, the output of the start signal of charging interval control unit 40 can be limited in the rising stage of commutating voltage.
For this reason, when commutating voltage rises and reaches luminous voltage V1, charging interval control unit 40 is changeable to be charged state and to export a start signal.Then, when commutating voltage is brought down below luminous voltage V1, although keep charged state, the changeable state for not performing charging of charging interval control unit 40.Therefore, charging interval control unit 40 only can export start signal in response to the rising of commutating voltage.Those skilled in the art can realize this set easily, therefore, omit detailed description herein.
For illustrating between charge period embodiment illustrated in fig. 4, the electric current S3 of LED channel LED1 can be used, but the present invention is not limited to this.According to the intention of designer, charging interval control unit 40 can be set to the electricity detecting electric current S7 in the level of commutating voltage S1, the electricity being supplied to the electric current S2 of LED channel LED1 to LED4, current control circuit 14, thus performs charging in response to the rising of commutating voltage when LED channel LED1 is luminous.
According to embodiments of the invention, the level that control period can be set to comprise commutating voltage is lower than during the luminous voltage making LED channel minimally luminance.In response to control period, during the commutating voltage of the level that can be set to commutating voltage between charge period higher than control period.
In other words, during the level that can be set to comprise commutating voltage between charge period is equal to or higher than the luminous voltage making LED channel minimally luminance, and the maximum of level lower than commutating voltage is set to.
In an embodiment of the present invention, owing to performing charging at magnitude of voltage lower than during commutating voltage maximum, therefore capable of reducing energy consumption.
Further, as shown in Figure 5, starting point between charge period can be arranged on the time point of LED channel LED1 luminescence, namely, commutating voltage exceedes the time point of luminous voltage V1, end point between charge period can be arranged on the time point of LED channel LED3 luminescence, and namely commutating voltage exceedes the time point of luminous voltage V3.
When being set to as shown in Figure 5 when between charge period, fully can ensure the charging interval of charge-discharge modules 60, and charge-discharge modules 60 can charge when more high level.
Further, as shown in Figure 6, starting point between charge period can be set to the time point of LED channel LED2 luminescence, namely commutating voltage exceedes the time point of luminous voltage V2, end point between charge period can be set to the time point of LED channel LED3 luminescence, and namely commutating voltage exceedes the time point of luminous voltage V3.
Be set to as shown in Figure 6 when between charge period, charge-discharge modules 60 can charge when high level.
Further, as shown in Figure 7, all charging can be performed during commutating voltage rises and during commutating voltage decline.
For this reason, when from commutating voltage S1, be supplied to electric current S7 that the electric current S2 of LED channel LED1 to LED4, the electric current S3 to S6 of the current path of each LED channel LED1 to LED4 and current control circuit reach 14 be namely supplied to the judgement source selected in the electric current of electric current inductive reactance Rs enter in response to commutating voltage rising or decline the state that can meet between charge period time, charging interval control unit 40 can be set to the start signal exporting charging.
As shown in Fig. 4 to 7, when being opened by control unit 42 discharge time at control period discharge switch 46, the voltage being stored in charge-discharge modules 60 can be applicable to LED channel LED1 to LED4.
For realizing the discharge operation shown in Fig. 4 to Fig. 7, by selecting the electric current S3 to S6 in the current path of commutating voltage S1, the electric current S2 being fed to LED channel LED1 to LED4, each LED channel LED1 to LED4, that namely the electric current S7 of current control circuit 14 is fed in the electric current of electric current inductive reactance Rs is one or more as judging source Sb, and the control unit 42 discharge time shown in Fig. 1 can arrange starting point and the end point of control period.
Such as, when the magnitude of current of the electric current S2 being fed to LED channel LED1 to LED4 is brought down below preset value, namely in response to the magnitude of current only having the state of LED channel LED1 luminescence to supply, the exportable start signal of control circuit 42 discharge time.Now, assuming that output signal the high level being output in and representing initiate mode.
When upon discharging, the start signal of control unit 42 is transferred to discharge switch 46, discharge switch 46 can open to be stored in the tension discharge of capacitor C to LED channel LED1 to LED4.Like this, be difference commutating voltage and the voltage being applied to LED channel by charge-discharge modules 60, diode D can be added.
As shown in Fig. 4 or 7, when the voltage being stored in charge-discharge modules 60 is applied to LED channel LED1 to LED4, lamp 10 can keep the minimum luminance making LED channel LED1 luminescence.
As illustrated in Figures 5 and 6, when charge-discharge modules 60 charges with the voltage being equal to or greater than luminous voltage V2, lamp 10 can keep the minimum luminance making LED channel LED1 and LED2 luminescence.
When voltage control unit 48 is connected with charge-discharge modules 60, voltage control unit 48 can judge that the voltage of charge-discharge modules 60 is equal to or greater than the first state of preset charged level.
Further, as shown in Figure 8, in order to judge that the voltage of charge-discharge modules 60 is equal to or greater than the third state that the second state of commutating voltage and commutating voltage are equal to or less than predetermined level, voltage control unit 48 can be set to the electric current S2 that receives commutating voltage S1 or be supplied to LED channel LED1 to LED4 using as judgement source Sc.
Voltage control unit 48 can determine the second state by being compared by the voltage of commutating voltage S1 or the electric current S2 and charge-discharge modules 60 that are supplied to LED channel LED1 to LED4, and passes through the level of the internal reference voltage and commutating voltage S1 with constant level to compare and can determine the third state.
The embodiment of an alternative embodiment of the invention Fig. 9 shown in Fig. 9 can comprise control unit 42 discharge time, discharge switch 46, charge-discharge modules 60 reduce circuit as flicker.In the embodiment shown in fig. 9, represent with identical sequence number with identical parts embodiment illustrated in fig. 1, and repeated description repeats no more.
What be namely supplied in the electric current of electric current inductive reactance Rs by selecting the electric current S7 as the electric current S3 to S6 judged in the current path of commutating voltage S1, the electric current S2 being supplied to LED channel LED1 to LED4 of source Sb, each LED channel LED1 to LED4, current control circuit 14 is one or more, and discharge time, control unit 42 can arrange beginning and the end point of control period.
Charge-discharge modules 60 can comprise capacitor C as shown in Figure 10, or comprises as shown in figure 11 and fill out paddy circuit.
Charge-discharge modules 60 can charge with the commutating voltage of the node N1 equal with S1.When discharge switch 46 is opened, charge-discharge modules 60 provides voltage by node N2 to LED channel LED1 to LED4.
Discharge switch 46 can according to the control opening/closing of control unit 42 discharge time.
In other words, discharge switch 46 can be controlled at control period control unit discharge time 42 based on judgement source Sb to open.When discharge switch 46 is opened, the voltage of charge-discharge modules 60 provides to LED channel LED1 to LED4 by node N2.
The charge-discharge modules 60 of Fig. 9, discharge switch 46 and discharge time control unit 42 can to arrange as shown in Figure 10.
Charge-discharge modules 60 can comprise capacitor C1 and diode D1.Diode D1 can be set to the commutating voltage of one-way transmission node N1 in capacitor C1, and capacitor C1 can be set to the example of discharge and recharge element.
Discharge time, control unit 42 can comprise resistance R3 and R4 and transistor Q2.Transistor Q2 can comprise npn type bipolar transistor.Resistance R3 and R4 be connected in parallel can be set to split judgement source Sb, and by the voltage transmission after segmentation to the base stage of transistor Q2, transistor Q2 can be set to change according to the voltage status of base stage the voltage status being applied to resistance R2.
Discharge switch 46 can comprise resistance R1, R2 and transistor Q1 and diode D2.Transistor Q1 can comprise nmos pass transistor.Between the grid that resistance R1 can be arranged on transistor Q1 and source electrode, resistance R2 can be arranged between the grid of transistor Q1 and the collector electrode of transistor Q2.The source electrode of transistor Q1 can be connected with capacitor C1, and the drain electrode of transistor Q1 can be connected by diode D2 with node N2.
With reference to Figure 12 key diagram 9 and operation embodiment illustrated in fig. 10.Figure 12 represents that the trough phase that commutating voltage drops to below the luminous voltage V1 of LED channel LED1 is set to control period.At this control period, judgement source Sb can be activated.
According to Fig. 9 and setting embodiment illustrated in fig. 10, during commutating voltage rise/fall, judgement source Sb can not be activated, but keep luminous voltage to be V1 or higher.
When un-activation judges source Sb, discharge time, the transistor Q2 of control unit 42 can remain closed condition, and the transistor Q1 of discharge switch 46 can with discharge time control unit 42 state be associated and remain closed condition.
When un-activation judges source Sb, commutating voltage is supplied to capacitor C1 by diode D1.Now, commutating voltage can remain a level value, and this commutating voltage can keep luminous voltage to be V1 or higher when rising or decline.Therefore, as shown in figure 12, in response to the rising of commutating voltage, can charge to capacitor C1.When commutating voltage declines, capacitor C1 can remain on charged state.
Then, when commutating voltage is brought down below luminous voltage V1, judge that source Sb can be activated.When judging that source Sb activates, discharge time, the transistor Q2 of control unit 42 can open, and the switching voltage between collector and emitter can be switched to high level.When transistor Q2 opens, the transistor Q1 of discharge switch 46 also can be opened by the high level voltage being applied to grid.
In other words, measure voltage Sb can activate to form the current path comprising transistor Q1 and diode D2.Therefore, the voltage be stored in capacitor C1 is applied to node N2 by the current path be formed in discharge switch 46.As a result, the voltage being stored in capacitor C1 is fed to LED channel LED1 to LED4 by node N2.
Therefore, capacitor C1 can be discharged at control period, and can keep the brightness being equal to or greater than minimum luminance, therefore can reduce the generation of flicker.
In the embodiment shown in fig. 9, charge-discharge modules 60 can comprise fills out paddy circuit, as shown in figure 11.In fig. 11, discharge time, control unit 42 can have the setting identical with such as Figure 10 with discharge switch 46.Therefore, identical description repeats no more.
In charge-discharge modules 60 as shown in figure 11, capacitor C2 and C3 and diode D3 to D5 may correspond in filling out paddy circuit.
Diode D4 can be connected between capacitor C2 and C3 by forward.Diode D4 can Opposite direction connection between diode D1 and capacitor C3.Capacitor C2 and diode D5 can be in parallel with diode D1.Diode D4 can be connected between the diode D3 of ground connection and capacitor C3.Diode D3 can Opposite direction connection between capacitor C2 and earth terminal.
When filling out paddy circuit and being arranged in charge-discharge modules 60, charge-discharge modules 60 can be arranged so that, capacitor C2 and C3 is chained together in response to charged state, and capacitor C2 and C3 is connected in parallel in response to discharge condition.
When judging that source Sb is deactivated, discharge switch 46 can remain on closed condition.Therefore, charge-discharge modules 60 can utilize the commutating voltage provided by diode D1 to charge.
Further, when judging that source Sb activates, discharge switch 46 can be opened.Therefore, the voltage of storage is provided to node N2 by the current path being formed at discharge switch 46 by charge-discharge modules 60.As a result, the voltage being stored in charge-discharge modules 60 is provided to LED channel LED1 to LED4 by node N2.
Therefore, at control period, capacitor C2 and C3 can discharge, and brightness can remain on and is equal to or higher than minimum luminance, and result reduces the generation of flicker.
In an embodiment of the present invention, current control circuit 14 can comprise transistor 50, its in each switching circuit 31 to 34 as switch element to form current path.
As shown in figure 13, each transistor 52 can form behaviour area, and it has different sizes in response to the magnitude of current.
In other words, in current control circuit 14, each transistor 52 of current path is provided can to have in response to the adjustable resistance value of current drain.
Therefore, it is lower that the transistor 52 having a large amount of electric current to flow through can be designed to the resistance value when forming larger behaviour area.As a result, the heating problem of current control circuit 14 is improved.
In the embodiment set by the present invention, the brightness of the LED light device driven by commutating voltage can remain on and be equal to or higher than minimum luminance, and during not having whole lamp all to extinguish, therefore, it is possible to reduce the generation of flicker.
According to embodiments of the invention, low value capacitor can be used for fully reducing the flicker that voltage charging and discharging causes.Therefore, even if employ capacitor, the reduction of life-span and power coefficient also can minimize, and also can reduce the generation of flicker.
In addition, the present invention performs the charging operations reducing flicker with the level of the peak value (maximum) lower than commutating voltage, therefore can avoid using extra voltage to carry out unnecessary charging operations, thus can make minimum power consumption.
Therefore, the reliability of LED light device can be improved.
Claims (21)
1. a control circuit for LED light device, described LED light device comprises multiple LED channel, and described control circuit comprises:
Current control circuit, it is in response to commutating voltage, provides corresponding to LED channel current path luminous successively;
Flicker reduction circuit, comprise and carry out by commutating voltage the charge-discharge modules that charges and LED channel is discharged, described flicker reduction circuit is configured to control charging interval of charge-discharge modules, charging voltage and one or more in discharge time, so that described charge-discharge modules is at least that voltage is provided to LED channel by minimum control period at the magnitude of current being provided to LED channel.。
2. control circuit according to claim 1, is characterized in that:
Described charge-discharge modules comprises capacitor or fills out paddy circuit.
3. control circuit according to claim 1, is characterized in that:
Utilize that to judge in the induced current of electric current in the current path of the commutating voltage in source, the electric current being provided to LED channel, each LED channel and current control circuit as common judgement source or each one or more, described flicker reduction circuit controls charging interval, charging voltage and one or more in discharge time.
4. control circuit according to claim 1, is characterized in that:
Become the control period of the level of the minimum luminance lower than LED channel in response to commutating voltage, described flicker reduction circuit provides voltage.
5. control circuit according to claim 1, is characterized in that, it is one or more that described flicker reduction circuit comprises in charging control circuit and charge/discharge control circuit,
Described charging control circuit is configured to provide described commutating voltage to described charge-discharge modules during preset charged;
Described charge/discharge control circuit is configured to, at described control period, the voltage of described charge-discharge modules is provided to described LED channel.
6. control circuit according to claim 5, is characterized in that:
Be set between described charge period to comprise level be equal to or higher than LED channel minimally luminance time luminous voltage during.
7. control circuit according to claim 6, is characterized in that:
Luminous voltage when level keeps maximum luminance lower than described LED channel is set between described charge period.
8., according to claim 5 or control circuit according to claim 6, it is characterized in that:
Commutating voltage rising area and/or decline district is arranged between described charge period.
9. control circuit according to claim 5, is characterized in that, described charging control circuit comprises:
Charge switch, is configured to switch the supply of described commutating voltage to described charge-discharge modules;
Charging interval control unit, is configured to open described charge switch between described charge period.
10. control circuit according to claim 5, is characterized in that, described charge/discharge control circuit comprises:
Discharge switch, is configured to switch the supply of described voltage to described multiple LED channel of described charge-discharge modules;
Discharge time, control unit, was configured to open described discharge switch at described control period.
11. control circuits according to claim 5, is characterized in that:
Described charge/discharge control circuit provides the voltage of described charge-discharge modules to the input of arbitrary described LED channel.
12. control circuits according to claim 1, is characterized in that:
Described flicker reduction circuit comprises voltage control unit, described voltage control unit is configured to provide the voltage control signal representing the uncomfortable state of charging, the uncomfortable state of described charging comprises the first state, second state, one or more in the third state, in described first state, the described voltage of described charge-discharge modules is equal to or greater than preset charged level, in described second state, the described voltage of described charge-discharge modules is equal to or greater than described rectified voltage level, in the described third state, described commutating voltage is equal to or less than predetermined level, described flicker reduction circuit utilizes described commutating voltage to stop charging operations in response to the uncomfortable state of described charging.
13. control circuits according to claim 12, is characterized in that, described flicker reduction circuit comprises:
Charging control circuit, be configured to the preset charged of the uncomfortable state of described charging without corresponding relation during provide described commutating voltage to described charge-discharge modules;
Charge/discharge control circuit, is configured to provide the voltage of described charge-discharge modules at described control period to described LED channel.
14. control circuits according to claim 13, is characterized in that, described charging control circuit comprises:
Charge switch, is configured to switch the supply of described commutating voltage to described charge-discharge modules;
Charging interval control unit, is configured to the start signal being provided for opening described charge switch between described charge period;
ON-OFF control circuit, is configured to, not corresponding with the uncomfortable state of described charging but during meeting between described charge period, open described charge switch according to described voltage control signal and described start signal.
15. control circuits according to claim 1, is characterized in that:
Described current control circuit comprises the switch element for forming current path in each LED channel, and the behaviour area of each switch element has different sizes in response to the magnitude of current, and its resistance value can adjust in response to current drain.
The control circuit of 16. 1 kinds of LED light device, described LED light device comprises multiple LED channel, and described control circuit comprises charge-discharge modules, and described charge-discharge modules is charged by the commutating voltage being provided to multiple LED channel, and discharge to described LED channel, it is characterized in that:
It is one or more that described control circuit controls in the discharge time of charging interval, charging voltage, charge-discharge modules, makes described charge-discharge modules at least provide voltage at the control period that the magnitude of current being provided to LED channel is minimum to LED channel.。
17. control circuits according to claim 16, is characterized in that:
Described charge-discharge modules comprises capacitor and/or fills out paddy circuit.
18. control circuits according to claim 16, is characterized in that:
Utilize as the electric current in the current path of common judgement source or the commutating voltage in each judgement source, the electric current being provided to described LED channel, each LED channel, one or more for what provide in the induced current of the current control circuit of current path to LED channel, described control circuit controls charging interval, charging voltage, one or more in discharge time.
19. control circuits according to claim 16, also comprise charging control circuit and/or charge/discharge control circuit, and described charging control circuit is configured to provide described commutating voltage to described charge-discharge modules during preset charged;
Described charge/discharge control circuit is configured to, at described control period, the voltage of described charge-discharge modules is provided to described LED channel.
20. control circuits according to claim 19, also comprise voltage control unit, described voltage control unit is configured to provide the voltage control signal representing the uncomfortable state of charging, the uncomfortable state of described charging comprises the first state, second state, one or more in the third state, in described first state, the voltage of described charge-discharge modules is equal to or greater than preset charged level, in described second state, the voltage of described charge-discharge modules is equal to or greater than described rectified voltage level, in the described third state, described commutating voltage is equal to or less than predetermined level, wherein, described control circuit utilizes described commutating voltage to stop described charging operations in response to the uncomfortable state of described charging.
21. control circuits according to claim 20, described charging control circuit comprises:
Charge switch, is configured to switch the supply of described commutating voltage to described charge-discharge modules;
Charging interval control unit, is configured to the start signal being provided for opening charge switch between described charge period;
ON-OFF control circuit, is configured to, not corresponding with the uncomfortable state of described charging but during meeting between described charge period, open described charge switch according to described voltage control signal and described start signal; Wherein, described charging control circuit provides described commutating voltage to described charge-discharge modules during the preset charged not corresponding with the uncomfortable state of described charging.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2013-0021909 | 2013-02-28 | ||
| KR1020130021909A KR101552824B1 (en) | 2013-02-28 | 2013-02-28 | Circuit to control led lighting apparatus |
| PCT/KR2014/001651 WO2014133349A2 (en) | 2013-02-28 | 2014-02-27 | Control circuit of light-emitting diode lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105122944A true CN105122944A (en) | 2015-12-02 |
| CN105122944B CN105122944B (en) | 2017-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201480011047.6A Active CN105122944B (en) | 2013-02-28 | 2014-02-27 | The control circuit of LED light device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9439258B2 (en) |
| KR (1) | KR101552824B1 (en) |
| CN (1) | CN105122944B (en) |
| WO (1) | WO2014133349A2 (en) |
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| JP2019520667A (en) * | 2016-05-02 | 2019-07-18 | ルミレッズ リミテッド ライアビリティ カンパニー | Multi-Pad Multi-Junction LED Package with Tapped Linear Driver |
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| KR101490232B1 (en) * | 2013-05-20 | 2015-02-10 | 주식회사 루멘스 | LED illumination device for preventing flicker |
| KR102237030B1 (en) | 2014-10-22 | 2021-04-06 | 주식회사 실리콘웍스 | Driving circuit of lighting apparatus |
| KR101566515B1 (en) * | 2014-11-28 | 2015-11-05 | 류태하 | Flicker-Free AC LED Illumination System |
| WO2016093534A1 (en) * | 2014-12-12 | 2016-06-16 | 서울반도체 주식회사 | Led drive circuit with improved flicker performance, and led lighting device comprising same |
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| KR102263023B1 (en) * | 2014-12-30 | 2021-06-09 | 주식회사 실리콘웍스 | Apparatus for rear combination lamp |
| DE102016210736A1 (en) * | 2016-06-16 | 2017-12-21 | Zumtobel Lighting Gmbh | Arrangement and method for operating LEDs |
| IT201700032546A1 (en) * | 2017-03-24 | 2018-09-24 | Cynergi S R L | Electronic circuit for driving a string of light-emitting diodes |
| JP2022059090A (en) * | 2018-03-16 | 2022-04-13 | 株式会社ブリッジ・マーケット | LED drive circuit |
| US11144105B2 (en) * | 2018-10-30 | 2021-10-12 | Dell Products L.P. | Method and apparatus to provide platform power peak limiting based on charge of power assist unit |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20160014862A1 (en) | 2016-01-14 |
| WO2014133349A3 (en) | 2015-12-03 |
| KR20140107839A (en) | 2014-09-05 |
| WO2014133349A2 (en) | 2014-09-04 |
| US9439258B2 (en) | 2016-09-06 |
| CN105122944B (en) | 2017-03-29 |
| KR101552824B1 (en) | 2015-09-14 |
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